This pet is chosen among four vanity pets as a reward after completing a chain of Children's Week quests. These quests may be accessed by characters level 10+. See the Guide to Children's Week for a detailed walkthrough of this chain. Other rewards for the final quest include Mr. Wiggles, Whiskers the Rat, and Speedy. Collecting all four pets on the same character is possible (over the course of four years) since the quests are repeatable each year.

When I first heard the snail would be a pet, I was delighted. And then i screamed with unfathomable fury when I heard it was taken out! But then it was put back in again and my guildmates were like, "EAR PLUGS! GET THEM FOR US NAO!"

... And that was a week before I even GOT it.
Now I have the snail on my 'auto summon' and he's aaaallllways out following me. I even take him to the beach at Darkshore sometimes to play with his snaily bretheren. :D

I'm surprised at how well Scooter does against beasts. A critter to be reckoned with, like no other that I'm aware of in this way. I just did a lvl 7 v lvl 7 spider in duskwood and it was a 3 move crush of critter smokin beast!

http://schaffhauser.me/Warcraft#PetList shows this pet, in my inventory, as the highest possible health... and thats at uncommon. I will be curious to pop a rare stone on this. Could be a super tanky pet with shell and his absorb attack.